Tiberius has no damage fall off, meaning 650 damage every .7 seconds and .49 seconds no matter what range you're at. The best counter is someone like eminence Lian or a sniper who can deal more damage than Tiberius from afar.
If you play with zhin, it is advisable not to approach more than 20 feet from torvald, the greatest weakness that zhin can have is to be annulled and unable to escape.
Use your CC immunity legendary when facing him and use your totem whenever you see BK use his bomb. This can help you counter stun reliant champions for you and your team.
Use agility and then run circles around her the only way you will lose this is if she knows you are coming from a distance. Also your ultimate destroys her.